He’s got weaknesses which if exposed, (like they were under Ole when we decided to go from playing off the back foot to playing on the half way line) then yeah he’ll look poor.
In a 3, his weaknesses (pace, defending the channels, passing, being pressed) are covered up due to having 2 quick partners either side of him. Instead he can be the anchor and defend his box, and leave Yoro to rush out and defend in the channels, and leave Martinez to play the line splitting passes.
He’s always been great at being a pure box defender. Wouldn’t bother me at all if he started every week.